Exponent of 2 (value of i) in n-th number of form 2^i*7^j.

Terms

a(0) =0a(1) =1a(2) =2a(3) =0a(4) =3a(5) =1a(6) =4a(7) =2a(8) =5a(9) =0a(10) =3a(11) =6a(12) =1a(13) =4a(14) =7a(15) =2a(16) =5a(17) =8a(18) =0a(19) =3a(20) =6a(21) =9a(22) =1a(23) =4a(24) =7a(25) =10a(26) =2a(27) =5a(28) =8a(29) =11